Side element of a shoe upper



FIG. 1 is a side elevational view of a side element of shoe upper showing my new design;

FIG. 2 is a top plan view thereof; and,

FIG. 3 is a front elevational view thereof.

The broken line showing of a shoe in FIGS. 1-3 is for illustrative purposes only and forms no part of the claimed design. 

The ornamental design for a side element of a shoe upper, as shown and described. 